21565458119 has 2 divisors, whose sum is σ = 21565458120. Its totient is φ = 21565458118.

The previous prime is 21565458113. The next prime is 21565458121. The reversal of 21565458119 is 91185456512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21565458119 is a prime.

It is a super-2 number, since 2×21565458119² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 21565458121, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21565458113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10782729059 + 10782729060.

It is an arithmetic number, because the mean of its divisors is an integer number (10782729060).

Almost surely, 2^21565458119 is an apocalyptic number.

21565458119 is a deficient number, since it is larger than the sum of its proper divisors (1).

21565458119 is an equidigital number, since it uses as much as digits as its factorization.

21565458119 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432000, while the sum is 47.

The spelling of 21565458119 in words is "twenty-one billion, five hundred sixty-five million, four hundred fifty-eight thousand, one hundred nineteen".